Add agenttrace plugin

[luoyuctl]

Summary

• add agenttrace to Development & Workflow
• add the generated plugins.json and repo marketplace entries
• update the mirrored agenttrace manifest to use a lightweight plugin icon

agenttrace audits local AI coding-agent sessions across Claude Code, Codex CLI, Gemini CLI, Qwen Code, Aider, Cursor, OpenCode, and generic JSON/JSONL logs for spend, token waste, failures, latency, health, diffs, and CI-ready gate signals.

Validation

• /opt/homebrew/bin/python3.13 -m json.tool plugins.json
• /opt/homebrew/bin/python3.13 -m json.tool .agents/plugins/marketplace.json
• /opt/homebrew/bin/python3.13 -m json.tool plugins/luoyuctl/agenttrace/.codex-plugin/plugin.json
• /opt/homebrew/bin/python3.13 scripts/check-alphabetical.py README.md
• /opt/homebrew/bin/python3.13 scripts/validate-plugin-pr.py --base-ref origin/main
• git diff --check

[gemini-code-assist]

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[luoyuctl]

Status note: the repository checks are passing (alphabetical, Validate plugin bundles, and Sync marketplace artifacts with README). The remaining failed Kilo Code Review check appears to be review-service infrastructure rather than a code finding: its output says Review failed: prepareSession failed (500) and configured session ... not found, with zero annotations.